Magnetic structures of 2D and 3D nanoparticles : properties by Jean-Claude Serge Levy

By Jean-Claude Serge Levy

Magnetic nanoparticles look obviously in rock magnetism including a wide distribution of sizes and styles. they've got various functions from nano-size magnetic stories to metamaterials for electromagnetic waves in addition to organic purposes comparable to nanosurgery with minimum traumatism. Their long-ranged measurement- and shape-dependent dipolar interactions offer quite a few valuable properties.

This publication describes the practise in addition to the magnetic houses of nanoparticles and in addition considers 2nd dots, approximately round samples, elongated samples, and diverse assemblies of nanoparticles. The authors document the static magnetic buildings and dynamic homes of those nanoparticles and the topological defects in second and 3D nanoparticles with new examples of S-shaped vortex or antivortex and of bent vortex or antivortex in 3D nanoparticles. The spectrum of magnetic excitations is proven to show the incidence of gaps, a key for magnonic metamaterial units. Magnetic excited states also are thought of with their coupling to nanoparticle elastic properties.

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Example text

Of S, which is proportional to m2 , lies in the description of very hard units, which is the case of large units with interactions restricted at the surface such as colloids. Colloidal aggregation is an obvious limit case. At low temperature (T < 0, 1 = Tc ), where the temperature unit is the depth ε of the pair potential well as in the following, whatever the atomic stiffness S be, a dendrite fractal behavior is observed after a long diffusion time. So the 2D aggregation is mainly controlled by diffusion at such low temperatures.

In molecular dynamics, interactions and initial ground state are also defined as well as a unit time, and atomic motions are defined from solving equations of motions with some Langevin random part which takes into account thermal motion. So this method considers a regular variation with time and is well fitted for following the time evolution of thermal excitations at the expense of computer time. This method takes into account kinetic energy and can be used up to melting point with realistic results [166].

And in this experiment, only the external, surface skin of these domains is viewed. So the real problem of the magnetic structure of 3D nanoparticles is still open. Thus the interest in numerical simulations is quite obvious. Moreover, there are numerous numerical approaches of magnetic stable configurations which also lead to dynamics. That is why we are studying them before analyzing the experimental data on dynamics within a magnetic nanoparticle. , the Langevin equation for magnetic variation [31], and a standard numerical approach of micromagnetism based on the resolution of the Landau–Lifshitz–Gilbert equation December 17, 2015 12:53 PSP Book - 9in x 6in 01-Jean-Claude-Levy-c01 Experimental Status with damping: OOMMF [45].

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